补体激活途径有（ ）、（ ）、（ ）三条。
参考答案：经典途径 旁路途径 MBL途径
This book is written by my sister, _______ is working for CCTV. [ ]
A. she
B. that
C. whom
D. who
Graham Steell杂音见于下列疾病
A．二尖瓣狭窄伴肺动脉高压B．高血压性心脏病C．心包炎D．主动脉瓣关闭不全E．二尖瓣关闭不全
